The Cambridge Lawns neighborhood is distinguished by the signature evergreen trees that line the canal between Brewer Park and SW 62nd Avenue, visible from all approaches to the neighbhorhood. This graceful shade tree, growing to a height of as much as 70 feet and with long branches that sway in the wind, is commonly called the Australian Pine (also, "She-Oak"), while its scientific name is
Casuarina -- so-called because its foliage was thought to resemble the feathers of the
cassowary bird of the tree's native Australia.
Introduced to Florida before 1924, in recent years, the Casuarinas have been the target of criticism, chiefly it seems because they're "non-native" and considered "invasive" and also because they're susceptible to damage from high winds, presenting a potential storm hazard in hurricane season. Both both the non-native and storm-hazard charges can be levied against any number of other large tree species in Miami, including the voluminous tropical almonds that grow profusely on Cambridge Lawns properties and along both sides of the canal.
For some reason, however, the Casuarinas are singled out for all the "bad press," with some overlooking their valuable role as habitat for the neighborhood's abundant animal and bird life.
There are actually three types of Casuarina in South Florida and the trees along the Broad Canal are the seedless
Casuarina glauca, reproducing by shooting up suckers from around its base -- the reason they were originally planted along Miami-Dade drainage canals to help stabilize the soil, which is certainly the case along Broad Canal. That puts to rest the myth that these trees "spread their seeds" to other Miami-Dade waterways by dropping them into the canal, occasionally given as a pretext for wholesale felling of large stands of the trees.
There's another prevalent myth about the trees: that the Casuarina
"needles" deposit a chemical in the soil that keeps competing plants from growing. Again, not true. More likely is a simpler explanation that ground cover and shrubs tend to be crowded out by the trees’ dense shade and extensive roots.
Even so, that doesn't seem to be the case along Broad Canal. As a walk along SW 57 Drive and SW 58 Street over to Brewer Park demonstrates, there are no shortage of other trees growing side-by-wide with the Australian Pines, including native Gumbo Limbo, a few native Mahogany trees and the ever-present almonds.
As for the birds, a glance upward into the branches of the trees any evening shows that the native and non-native species alike simply love the Casuarinas that line the Broad Canal and that without them the birdlife in Cambridge Lawns would be far less abundant than it is today.
Other links of interest:
Tropical Audubon Society
TREEmendous Miami
Miami-Dade 'Adopt a Tree'
Note: This is the first in what we hope will be an ongoing series about the trees and birdlife of the Cambridge Lawns neighborhood, particularly along and around the Broad Canal.